Press



I A. A. BYERLEIN v 'PRE s Filed March 27- 1929 June 16, 1931,

gwventow Patented June 16, 1931 UNITED STATES PATENT OFFICE 1 ARTHUR A. YERLEIN, or DETROIT,' MICHIGAN, Assrenon, BY ransnn AssIGnMn-n'rs, T GENERAL MACHINERY CORPORATION, or HAMILTON, 0310, A CORPQRATION OF DELAWARE runs s1 Application filed March'27, 1929. Serial no; 350,310.

' This invention relates to presses, and more particularly topresses having amovable slide which is adjustably connected to the means which operates it. a

5 One object of the invention is the provision of a press of this character having a member or members adjustably supported on the die slide and pivotally connected to angularly:

moving arm or toggle link operating means, the upper end of the adjustable member being guided in a part which is attached to the slide so that bending forces applied to the member are taken by the slide. 7 F Other objects and advantages of the invention will be apparentfrom the following description and from the accompanying drawings; in which Fig. 1 is a central transverse vertical secqo tion through a portionof a press embodying the present invention; and r I Fig. 2 is a horizontal section on the line 22 of Fig. 1.

Referring to the embodiment of the invention illustrated in the drawings, 10 designates the frame of a press, only a portion of this frame being shown as it may have any suitable form well known in the art. Guided for reciprocatory movement in the frame 10 .are the plunger 11 and the blank holder 12, thev former being connected by a suitable crank connection 13 to the crank shaft 14, while the blank holderis operated by a system of toggle links from a pair of toggle shafts 15, one of which is provided on opposite sides of the press in accordance with the usual practice. Fixed to the rock shaft 15 is a toggle arm 16 which is pivotally connected to the upper end of the toggle link 17. The lower 40 end of the toggle link 17 is provided with a pin 20 which extends through the flattened lower end thereof and which is rotatably journaled in suitable bearing portions 21 in the bifurcated connection member 22. This connection member 22 forms the upper end of the side of the slide 12. Suitable adjusting and positioning nuts 26 and 27 are threaded on the rod 24 and cooperate with the upper and lower surfaces of the lug 25 to adj ustably fix'the rod 24 relatively to the slide12.

The slide projections 25 are preferably provided adjacent the four corners of the slide 12, extending forwardly and rearwardly therefrom as shown. Each corner of the slide is similarly constructed and'the four sets of toggle links provided on the two rock shafts 15 cause vertical reciprocato'ry movement of the slide 12 which is preferably actuated with a dwell in its movement so as to serve as a blank holder for sheet metal or the like and cooperate with the plunger or stamping slidell.

The provision of the adjustment of the relative setting of the rods 24 on the blank holder 12 permits variation of the upper and lower limits of travel-of the blank holder to compensate for dies of various depths.

It hasbeen found'that in prior constructions of this general nature considerable side pressure is applied to the threaded adjusting members on the slide as they are moved downwardly or raised by angularly movable toggle arms. The upper ends of the thread ed members must project some distance above the projections on the slide to which they are attached and the threaded members must either be'made' very large to take care of bending forces applied to them or else they are liable to fracture due to the pressures exerted at an angle to their longitudinal axes. Attempts have been made to remedy this condition in the past by interconnecting adja cent adjusting membersbut this merely serves to transfer abending force from one adjusting member to another without transmitting the bending force to the slide or some other large and rigid part which is adapted to assume it.

In accordance with the present invention the upper end of the various adjusting members24, where they are'connected to the lower ends of the toggle links 17 are so received in guide members fixed to' theslide that bendan ad usting member or threaded rod 24 whichextends through a lug 25 provided on ing' strains applied to. the threaded bolts or adjusting fmembers. is transferred directly and immediately to the slide. The upper ends of the various adjusting members 24 are positioned againstlateral movement in any 10 direction. The connecting members 22 at the upper ends of the threaded bolts 24 are guided for vertical movement freely within collars 30 which are fixed to the upper portion of the slide 12, preferably by means of bolts 31 or the like so that they may be readily fastened in place or removed. Each connecting member 22 is provided with a comparatively long preferably cylindrical bearing surface 32 which is received wit-h a sliding fit in a bore provided in the collar 30. The vertical height of the collar is preferably considerably less than the vertical extent of the bearing surface 32 on the connecting mem: ber 22 so that the latter may be moved up and down within the fixed collar 30 as the nuts 26 and 27 are adjusted and as the adjusting rod 24 is set to new positions in the slide. The fit between the bearing surface 32 on, the connecting member 22 and the hearing surface in the collar 30, while permitting free relative movement in a vertical direction, prevents any bending force exerted on adjusting member 24 from straining or bending the bolt, as such bending forces are immediately applied to the collar 30 which is fixed to the slide. All such bending forces are therefore immediately transferred to the slide and the adjusting members 2d are not injured. The collars or guides 30 are effective in the various positions of adjustment ted to the slide and have no bending effect on the bolts. By reason of the construction herein set forth the various parts may be made considerably lighter while obtaining strong and rigid construction. 7

While the form of apparatus herein de scribed constitutes a preferred embodiment of the invention, it is to be understood that the invention is not limited to this precise form of apparatus, and that changes may be made therein without departing from the scope of the invention which is defined in the appended claims:

hat is claimed is:

1. In a toggle press, a frame, a slide operable in said frame, a toggle link for operating said slide, a member adjustably supported on said slide and pivotally connected to said link, and a guide fixed to the slide and guiding an upper portion of said member to receive and withstand horizontal components of the thrust of said link when the link is inclined.

2. In a press, a frame, a slide operable in said frame, an angularly movable link for operating said slide, a member adjustably fixed to said slide and pivotally connected to said link, and a guide fixed to said slide and connection between the upper end of said threaded member and said link, and a guide fixed to the slide above said adjusting nuts, said guide slidably receiving the upper end of said threaded member.

l. In a press, a frame, a slide operable in said frame, an angularly movable link for operating said slide, a threaded member adjustably fixed to said slide, a pivotal connection between the upper end of said threaded member and said link, the upper end of said threaded member having a substantially cylindrical bearing surface, a collar fixed to said slide adjacent the upper end of said threaded member and having a cylindrical bore slidably receiving said bearing surface, the vertical extent of said bearing surface being much larger than the height of said collar so that bending strains applied to said threaded member are transmitted to the slide by said collar in the various positions of adj ustment of said threaded member.

5. In a toggle press, a frame, a slide opera ble in said frame with a dwell in its movements, a series of toggle links for operating said slide, threaded members adjustably sup ported on said slide adjacent the corners thereof; pivotal connections between the upper ends of said threaded members and the lower ends of said links, and a guide for the upper end of each threaded member, said guides being fixed directly to the slide adjacent the corners thereof and slidably receiving the upper portions of said threaded members.

In testimony whereof I hereto affix my signature.

ARTHUR A. BYERLEIN. 

